Part of my riding armor. Wearing it because I was investigating the small rib injury I sustained when falling off my bike two weeks ago. Now that I've mostly healed the big injuries (shoulder), the smaller ones are voting with their smaller, but longer-lasting pains.

The Fox Racing R3 Chest Guard is like a second rib cage, around your body's rib cage. Stiff plastic, held together with material that I think stiffens on impact.